/* ========== 重置 ========== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,figure,blockquote,address{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}

/* ========== 变量 ========== */
:root{
  --abyss:#03151B;
  --teal:#062A33;
  --grid-line:#0E4652;
  --mist:#E8FBFA;
  --aqua-gray:#9FC9CB;
  --cyan:#31F2E4;
  --coral:#FF6B4A;
  --lemon:#F4E45B;
  --violet:#8E7CFF;
  --white:#FFFFFF;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-num:"Barlow Condensed","Oswald","DIN Condensed","Roboto Condensed",ui-sans-serif,system-ui,sans-serif;
  --ease:cubic-bezier(.2,.8,.2,1);
  --dur:180ms;
  --edge:clamp(18px,4vw,72px);
  --maxw:1320px;
  --radius:2px;
}

/* ========== 基础排版 ========== */
body{
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  color:var(--mist);
  background-color:var(--abyss);
  background-image:
    radial-gradient(1200px 680px at 82% -10%, rgba(49,242,228,.14), transparent 62%),
    radial-gradient(820px 560px at 2% 6%, rgba(142,124,255,.12), transparent 66%),
    radial-gradient(1000px 760px at 50% 112%, rgba(255,107,74,.08), transparent 68%),
    repeating-linear-gradient(180deg, rgba(232,251,250,.03) 0 1px, transparent 1px 4px);
  background-attachment:fixed,fixed,fixed,scroll;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-weight:900;letter-spacing:-.04em;line-height:1.04}
h1{font-size:clamp(34px,6vw,72px)}
h2{font-size:clamp(24px,3vw,36px)}
h3{font-size:clamp(18px,2vw,24px)}
p{margin-bottom:1em}
p:last-child{margin-bottom:0}
a{color:var(--cyan)}
strong{font-weight:800}
::selection{background:var(--cyan);color:var(--abyss)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:var(--radius)}
#main-content{scroll-margin-top:104px}
#main-content:focus{outline:none}

/* ========== 布局 ========== */
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding-left:var(--edge);padding-right:var(--edge)}
.section{padding-top:clamp(36px,6vw,80px);padding-bottom:clamp(36px,6vw,80px)}
.split{display:grid;grid-template-columns:32fr 68fr;gap:clamp(20px,3vw,44px);align-items:start}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-8{grid-column:span 8}
.span-9{grid-column:span 9}
.rule{border:0;border-top:1px solid var(--grid-line);margin:0}

/* ========== 文本工具 ========== */
.eyebrow{display:inline-flex;align-items:center;gap:9px;font-family:var(--font-num);font-size:12px;font-weight:700;letter-spacing:.24em;text-transform:uppercase;color:var(--cyan);margin-bottom:14px}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--cyan)}
.lede{font-size:clamp(16px,1.5vw,20px);line-height:1.7;color:var(--aqua-gray);max-width:62ch}
.num-display{font-family:var(--font-num);font-weight:700;line-height:.86;letter-spacing:-.01em;color:var(--lemon);font-variant-numeric:tabular-nums}
.link-inline{display:inline-block;color:var(--cyan);text-decoration:none;border-bottom:1px solid rgba(49,242,228,.42);padding-bottom:1px;transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease)}
.link-inline:hover,.link-inline:focus-visible{color:var(--white);border-bottom-color:var(--white)}

/* ========== 按钮 ========== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;font-family:var(--font-sans);font-size:14px;font-weight:800;letter-spacing:.01em;line-height:1.2;text-decoration:none;border:1px solid transparent;border-radius:var(--radius);cursor:pointer;transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease)}
.btn-primary{background:var(--cyan);border-color:var(--cyan);color:var(--abyss)}
.btn-primary:hover,.btn-primary:focus-visible{background:var(--white);border-color:var(--white);color:var(--abyss);transform:translateY(-1px)}
.btn-ghost{background:transparent;border-color:var(--grid-line);color:var(--mist)}
.btn-ghost:hover,.btn-ghost:focus-visible{border-color:var(--cyan);color:var(--cyan)}
.btn-sm{padding:7px 14px;font-size:12px;letter-spacing:.04em}

/* ========== 面包屑 ========== */
.breadcrumb{margin-bottom:22px}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:12px;letter-spacing:.06em;color:var(--aqua-gray)}
.breadcrumb-item{display:inline-flex;align-items:center;gap:10px}
.breadcrumb-item + .breadcrumb-item::before{content:"/";color:var(--grid-line)}
.breadcrumb-item[aria-current="page"]{color:var(--mist)}
.breadcrumb-link{color:var(--aqua-gray);text-decoration:none;transition:color var(--dur) var(--ease)}
.breadcrumb-link:hover,.breadcrumb-link:focus-visible{color:var(--cyan)}

/* ========== 研究板 / 标签 ========== */
.panel{position:relative;padding:clamp(16px,2.2vw,26px);background:linear-gradient(180deg,rgba(6,42,51,.82),rgba(3,21,27,.6));border:1px solid var(--grid-line);border-radius:var(--radius)}
.panel::before{content:"";position:absolute;top:-1px;left:-1px;width:14px;height:14px;border-top:1px solid var(--cyan);border-left:1px solid var(--cyan)}
.panel-head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:10px 16px;margin-bottom:14px}
.panel-title{font-size:16px;font-weight:800;letter-spacing:-.01em;line-height:1.3}
.panel-meta{font-family:var(--font-num);font-size:12px;letter-spacing:.16em;color:var(--aqua-gray);text-transform:uppercase}
.tag{display:inline-flex;align-items:center;gap:6px;padding:3px 9px;font-size:11px;font-weight:700;letter-spacing:.1em;line-height:1.6;border:1px solid currentColor;border-radius:var(--radius);white-space:nowrap}
.tag-cyan{color:var(--cyan)}
.tag-coral{color:var(--coral)}
.tag-lemon{color:var(--lemon)}
.tag-violet{color:var(--violet)}

/* ========== 图片位 ========== */
.media-frame{position:relative;overflow:hidden;width:100%;aspect-ratio:16/9;border:1px solid var(--grid-line);border-radius:var(--radius);background:linear-gradient(150deg,var(--teal),var(--abyss) 72%)}
.media-frame::after{content:"";position:absolute;right:-1px;bottom:-1px;width:18px;height:18px;border-bottom:1px solid var(--cyan);border-right:1px solid var(--cyan);pointer-events:none}
.media-frame img{width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(1.05)}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-caption{margin-top:10px;font-size:12px;letter-spacing:.04em;color:var(--aqua-gray)}

/* ========== 标签页 ========== */
.tabs{margin-top:26px}
.tab-list{display:flex;flex-wrap:wrap;gap:4px;border-bottom:1px solid var(--grid-line)}
.tab{padding:10px 16px;font-size:14px;font-weight:800;letter-spacing:.02em;color:var(--aqua-gray);border:1px solid transparent;border-bottom:none;border-radius:var(--radius) var(--radius) 0 0;cursor:pointer;transition:color var(--dur) var(--ease),background var(--dur) var(--ease)}
.tab:hover{color:var(--mist)}
.tab[aria-selected="true"]{background:var(--cyan);border-color:var(--cyan);color:var(--abyss)}
.tab-panel{padding-top:20px}
.tab-panel[hidden]{display:none}
.tab-panel:not([hidden]){animation:tab-slide var(--dur) var(--ease) both}
@keyframes tab-slide{from{opacity:.35;transform:translateX(-12px)}to{opacity:1;transform:none}}

/* ========== 滚动显现 ========== */
.reveal-init{opacity:0;transform:translateY(16px);transition:opacity 260ms var(--ease),transform 260ms var(--ease)}
.reveal-init.is-revealed{opacity:1;transform:none}

/* ========== 头部 ========== */
.skip-link{position:absolute;left:16px;top:-70px;z-index:140;display:inline-block;padding:10px 18px;font-size:14px;font-weight:800;text-decoration:none;background:var(--cyan);color:var(--abyss);border-radius:var(--radius);transition:top var(--dur) var(--ease)}
.skip-link:focus{top:12px}
.site-header{position:sticky;top:0;z-index:80;padding:14px var(--edge) 12px;background:linear-gradient(180deg,rgba(3,21,27,.97),rgba(3,21,27,.78) 62%,rgba(3,21,27,0));backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);transition:padding var(--dur) var(--ease),background var(--dur) var(--ease)}
.site-header[data-condensed]{padding-top:8px;padding-bottom:8px;background:linear-gradient(180deg,rgba(3,21,27,.99),rgba(3,21,27,.92))}
.site-header[data-open]{background:var(--abyss)}
.header-track{position:relative;display:flex;align-items:center;justify-content:space-between;gap:16px;max-width:var(--maxw);margin:0 auto}
.header-island{display:flex;align-items:center;gap:14px;min-width:0;padding:8px 18px 8px 12px;background:rgba(6,42,51,.88);border:1px solid var(--grid-line);border-radius:999px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--mist)}
.brand-glyph{position:relative;flex:0 0 auto;width:22px;height:22px;border:1px solid var(--cyan);border-radius:var(--radius)}
.brand-glyph::before{content:"";position:absolute;inset:5px;background:var(--cyan);opacity:.85}
.brand-glyph::after{content:"";position:absolute;right:-3px;bottom:-3px;width:6px;height:6px;background:var(--lemon)}
.brand-text{display:flex;flex-direction:column;gap:1px;min-width:0}
.brand-name{font-size:15px;font-weight:900;letter-spacing:.02em;line-height:1.15;white-space:nowrap}
.brand-sub{font-family:var(--font-num);font-size:10px;font-weight:600;letter-spacing:.22em;line-height:1.2;color:var(--aqua-gray);white-space:nowrap}
.header-status{display:flex;align-items:center;gap:8px;margin:0;font-size:12px;letter-spacing:.02em;color:var(--aqua-gray);white-space:nowrap}
.status-dot{flex:0 0 auto;width:7px;height:7px;border-radius:50%;background:var(--lemon);box-shadow:0 0 0 0 rgba(244,228,91,.45);animation:status-pulse 2.6s var(--ease) infinite}
@keyframes status-pulse{0%{box-shadow:0 0 0 0 rgba(244,228,91,.45)}70%{box-shadow:0 0 0 7px rgba(244,228,91,0)}100%{box-shadow:0 0 0 0 rgba(244,228,91,0)}}
.nav-capsule{display:flex;align-items:center;gap:6px;padding:6px 6px 6px 10px;background:rgba(6,42,51,.88);border:1px solid var(--grid-line);border-radius:999px}
.site-nav{display:block}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{display:block}
.nav-link{display:block;padding:9px 14px;font-size:14px;font-weight:500;line-height:1.3;color:var(--aqua-gray);text-decoration:none;border-radius:999px;transition:color var(--dur) var(--ease),background var(--dur) var(--ease)}
.nav-link:hover{color:var(--mist);background:rgba(49,242,228,.1)}
.nav-link[aria-current="page"]{background:var(--cyan);color:var(--abyss);font-weight:800}
.nav-cta{flex:0 0 auto;border-radius:999px}
.nav-toggle{display:none;align-items:center;gap:8px;padding:7px 12px;font-size:12px;font-weight:800;letter-spacing:.12em;color:var(--mist);border:1px solid var(--grid-line);border-radius:999px;cursor:pointer}
.nav-toggle-icon{display:flex;flex-direction:column;justify-content:center;gap:4px;width:14px}
.nav-toggle-bar{display:block;width:100%;height:1px;background:var(--cyan);transition:transform var(--dur) var(--ease)}
.site-header[data-open] .nav-toggle-bar:first-child{transform:translateY(2.5px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bar:last-child{transform:translateY(-2.5px) rotate(-45deg)}
.nav-toggle-label{white-space:nowrap}
.scroll-meter{position:absolute;left:0;right:0;bottom:0;height:2px;background:rgba(14,70,82,.55);overflow:hidden}
.scroll-meter-fill{display:block;width:100%;height:100%;transform-origin:0 50%;transform:scaleX(var(--progress,0));background:linear-gradient(90deg,var(--cyan),var(--lemon))}

/* ========== 页脚 ========== */
.site-footer{margin-top:clamp(48px,8vh,96px);padding:clamp(38px,6vw,72px) var(--edge) 26px;background:linear-gradient(180deg,rgba(6,42,51,.55),rgba(3,21,27,.98) 58%);border-top:1px solid var(--grid-line)}
.footer-inner{max-width:var(--maxw);margin:0 auto}
.footer-grid{display:grid;grid-template-columns:minmax(220px,1.5fr) repeat(3,minmax(96px,.85fr)) minmax(200px,1.2fr);gap:clamp(18px,2.6vw,38px);align-items:start}
.footer-lead{position:relative;padding-left:16px;border-left:1px solid var(--cyan)}
.footer-kicker{margin-bottom:10px;font-family:var(--font-num);font-size:11px;font-weight:700;letter-spacing:.3em;color:var(--cyan);text-transform:uppercase}
.footer-brandline{margin-bottom:10px;font-size:clamp(17px,1.8vw,21px);font-weight:900;letter-spacing:-.02em;line-height:1.2;color:var(--mist)}
.footer-note{font-size:13px;line-height:1.7;color:var(--aqua-gray);max-width:34ch}
.footer-col-title{display:flex;align-items:center;gap:8px;margin-bottom:14px;font-size:12px;font-weight:800;letter-spacing:.2em;line-height:1.4;color:var(--mist)}
.footer-col-title::before{content:"";width:12px;height:1px;background:var(--cyan)}
.footer-list{display:grid;gap:9px}
.footer-link{display:inline-block;padding:2px 0;font-size:14px;color:var(--aqua-gray);text-decoration:none;border-bottom:1px solid transparent;transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease)}
.footer-link:hover,.footer-link:focus-visible{color:var(--cyan);border-bottom-color:rgba(49,242,228,.5)}
.footer-address{display:grid;gap:9px;font-style:normal;font-size:13px;line-height:1.65;color:var(--aqua-gray);word-break:break-word}
.footer-line{display:block}
.footer-key{display:inline-block;margin-right:8px;padding:0 5px;font-size:11px;font-weight:700;letter-spacing:.1em;color:var(--cyan);border:1px solid rgba(49,242,228,.35);border-radius:var(--radius)}
.footer-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px 24px;margin-top:clamp(28px,4vw,48px);padding-top:18px;border-top:1px solid var(--grid-line);font-size:12px;letter-spacing:.04em;color:var(--aqua-gray)}
.footer-copy,.footer-icp{margin:0}
.footer-icp{margin-left:auto;color:var(--aqua-gray)}

/* ========== 响应式 ========== */
@media (max-width:1240px){
  .status-text{display:none}
}
@media (max-width:1120px){
  .split{grid-template-columns:40fr 60fr}
  .span-3,.span-4,.span-5{grid-column:span 6}
  .span-8,.span-9{grid-column:span 12}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-lead{grid-column:1/-1}
}
@media (max-width:1024px){
  .site-header{padding:10px 14px 8px}
  .header-track{gap:10px}
  .header-island{flex:1 1 auto;padding:6px 12px 6px 9px;gap:9px;border-radius:999px}
  .nav-capsule{position:relative;padding:4px 5px 4px 6px;gap:4px}
  .nav-toggle{display:inline-flex}
  .site-nav{display:none;position:absolute;left:0;right:0;top:calc(100% + 12px);padding:8px;background:rgba(6,42,51,.99);border:1px solid var(--grid-line);border-radius:4px;box-shadow:0 24px 44px rgba(0,0,0,.55)}
  .site-header[data-open] .site-nav{display:block;animation:nav-drop 160ms var(--ease) both}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-item{width:100%}
  .nav-link{padding:12px 14px;font-size:15px;border-radius:var(--radius)}
  .nav-cta{border-radius:999px;padding:8px 12px;font-size:12px}
}
@keyframes nav-drop{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}
@media (max-width:760px){
  body{font-size:16px}
  .split{grid-template-columns:1fr}
  .grid-12{grid-template-columns:1fr;gap:18px}
  .span-3,.span-4,.span-5,.span-8,.span-9{grid-column:1/-1}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-lead{grid-column:auto}
  .footer-icp{margin-left:0}
  .brand-sub{font-size:9px;letter-spacing:.16em}
  .media-frame--wide{aspect-ratio:16/9}
}
@media (max-width:420px){
  .nav-toggle-label{display:none}
  .brand-name{font-size:14px}
}

/* ========== 动效可访问性 ========== */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  .reveal-init{opacity:1;transform:none}
  .scroll-meter-fill{transition:none}
}