:root{
    --bg:#141416;
    --deepest:#1c1c1e;
    --mid:#2c2c2e;
    --surface:#3a3a3c;
    --border:rgba(255,255,255,.10);
    --border-soft:rgba(255,255,255,.08);
    --text:rgba(255,255,255,.92);
    --text-2:rgba(255,255,255,.70);
    --muted:rgba(255,255,255,.50);
    --dim:rgba(255,255,255,.38);
    --blue:#0a84ff;
    --green:#30d158;
    --orange:#ff9f0a;
    --red:#ff453a;
    --serif:Georgia,"New York","Times New Roman",serif;
    --sans:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI","PingFang SC","Hiragino Sans GB",sans-serif;
    --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,monospace;
    --toolbar-bg:rgba(20,20,22,.94);
    --accent:#69b9ff;
    --accent-soft:rgba(10,132,255,.10);
    --hover:rgba(255,255,255,.06);
    --link:#8cc5ff;
    --link-border:rgba(140,197,255,.6);
    --quiet-symbol:rgba(255,255,255,.35);
    --scrollbar:rgba(255,255,255,.18);
    --switch-bg:#202125;
    --tag-blue:#9cc9ff;
    --tag-green:#9ff0b8;
    color-scheme:dark;
    --radius-card:10px;
    --radius-panel:14px;
    --radius-pill:999px;
  }
  :root[data-theme="light"]{
    --bg:#f7f8fa;
    --deepest:#fff;
    --mid:#fff;
    --surface:#fff;
    --border:rgba(31,45,60,.16);
    --border-soft:rgba(31,45,60,.11);
    --text:#1b2633;
    --text-2:#394958;
    --muted:#667381;
    --dim:#6d7984;
    --blue:#0867b8;
    --green:#167546;
    --orange:#a65300;
    --red:#b53932;
    --toolbar-bg:rgba(247,248,250,.94);
    --accent:#0867b8;
    --accent-soft:rgba(8,103,184,.09);
    --hover:rgba(31,45,60,.05);
    --link:#075ca8;
    --link-border:rgba(7,92,168,.45);
    --quiet-symbol:#808b94;
    --scrollbar:rgba(31,45,60,.25);
    --switch-bg:#fff;
    --tag-blue:#075ca8;
    --tag-green:#167546;
    color-scheme:light;
  }
  *{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    margin:0;background:var(--bg);color:var(--text);
    font-family:var(--sans);font-size:15px;line-height:1.5;
    -webkit-font-smoothing:antialiased;

  }
  a{color:var(--blue);text-decoration:none}
  a:hover{text-decoration:underline}
  :focus-visible{outline:2px solid var(--blue);outline-offset:2px;border-radius:4px}

  /* 报告页眉与章节导航 */
  .toolbar{
    position:sticky;top:0;z-index:20;height:64px;
    background:var(--toolbar-bg);border-bottom:1px solid var(--border-soft);
    -webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
  }
  .toolbar-inner{
    max-width:1280px;height:100%;margin:0 auto;padding:0 28px;
    display:flex;align-items:center;gap:20px;
  }
  .publication{display:flex;align-items:center;gap:10px;flex:none;color:var(--text);font-size:14px;font-weight:600;letter-spacing:.04em;white-space:nowrap}
  .publication-mark{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;flex:none}
  .publication-mark img{display:block;width:100%;height:100%;object-fit:contain}
  .publication-mark .mark-light{display:none}
  :root[data-theme="light"] .publication-mark .mark-dark{display:none}
  :root[data-theme="light"] .publication-mark .mark-light{display:block}
  .publication-label{color:var(--muted);font-weight:400;letter-spacing:0}
  .toolbar h1{
    flex:1;min-width:0;margin:0;padding-left:20px;border-left:1px solid var(--border);
    font-family:var(--sans);font-weight:400;font-size:13px;line-height:1.4;color:var(--text-2);
    overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
  }
  .toolbar .meta{font-family:var(--mono);font-size:11px;color:var(--muted);white-space:nowrap}

  .shell{max-width:1280px;margin:0 auto;display:grid;grid-template-columns:240px minmax(0,1fr)}
  .sidebar{
    position:sticky;top:64px;align-self:start;height:calc(100dvh - 64px);min-height:0;
    padding:30px 20px 24px 28px;border-right:1px solid var(--border-soft);
    display:flex;flex-direction:column;
  }
  .brand{margin:0 0 20px;color:var(--text);font-size:14px;font-weight:600;line-height:1.4;letter-spacing:.04em}
  .brand small{display:block;margin-top:6px;font-size:11px;font-weight:400;letter-spacing:0;color:var(--muted)}
  .nav{display:flex;flex-direction:column;gap:3px;min-height:0;overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:var(--scrollbar) transparent}
  .nav a{
    position:relative;display:flex;align-items:center;gap:12px;min-height:42px;padding:10px 10px;
    border-radius:6px;color:var(--text-2);font-size:13px;line-height:1.4;
    transition:background-color .2s ease-out,color .2s ease-out;
  }
  .nav a:hover{background:var(--hover);color:var(--text);text-decoration:none}
  .nav a.active{background:var(--accent-soft);color:var(--text)}
  .nav a.active::before{content:"";position:absolute;left:0;top:10px;bottom:10px;width:2px;border-radius:2px;background:var(--accent)}
  .nav a span.i{font-family:var(--mono);font-size:11px;color:var(--muted);width:18px;flex:none}
  .nav a.active span.i{color:var(--accent)}
  .nav-hint{display:none}
  .sidebar .foot{margin: auto 0 0;padding:22px 0 0;color:var(--muted);font-size:11px;line-height:1.7}
  .theme-toggle{
    display:inline-flex;align-items:center;gap:10px;align-self:flex-start;margin-top:18px;padding:0;
    border:0;background:transparent;color:var(--text-2);font:500 12px var(--sans);line-height:1.2;
    cursor:pointer;-webkit-tap-highlight-color:transparent;
  }
  .theme-toggle:hover{color:var(--text)}
  .theme-track{
    display:flex;align-items:center;width:70px;height:38px;padding:4px;border-radius:15px;
    background:linear-gradient(145deg,#0b0c11,#191b24);
    box-shadow:inset 2px 3px 7px rgba(0,0,0,.72),inset -1px -1px 2px rgba(255,255,255,.05),0 1px 0 rgba(255,255,255,.06);
    transition:background .45s ease,box-shadow .45s ease;
  }
  .theme-knob{
    position:relative;isolation:isolate;display:grid;place-items:center;width:30px;height:30px;border-radius:11px;
    color:#e4e1ff;background:linear-gradient(145deg,#555667 0%,#242633 76%);
    border:1px solid rgba(255,255,255,.16);
    box-shadow:inset 0 1px 2px rgba(255,255,255,.22),0 3px 6px rgba(0,0,0,.5),0 3px 12px rgba(134,133,255,.55),0 1px 3px rgba(190,187,255,.55);
    transition:transform .45s cubic-bezier(.2,.8,.2,1),background .45s ease,box-shadow .45s ease,color .45s ease,border-color .45s ease;
  }
  /* A masked rotating highlight follows the knob; it only runs on deliberate hover or keyboard focus. */
  .theme-orbit{
    position:absolute;inset:-4px;z-index:1;overflow:hidden;border-radius:15px;padding:3px;
    opacity:0;pointer-events:none;transition:opacity .2s ease;
    -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
    -webkit-mask-composite:xor;mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
    mask-composite:exclude;
  }
  .theme-orbit > span{
    position:absolute;inset:-55%;
    background:conic-gradient(from 0deg,transparent 0 64%,rgba(133,129,255,.1) 68%,#a9a4ff 75%,#f5f1ff 78%,#8a86ff 81%,transparent 88%);
  }
  :root[data-theme="light"] .theme-orbit > span{
    background:conic-gradient(from 0deg,transparent 0 64%,rgba(255,192,74,.1) 68%,#ffb83d 75%,#fff7dc 78%,#ffc55c 81%,transparent 88%);
  }
  .theme-knob::before{
    content:"";position:absolute;inset:-8px;z-index:-1;border-radius:50%;pointer-events:none;opacity:0;
    background:radial-gradient(ellipse at 50% 5%,rgba(149,139,255,.85),transparent 50%);
    filter:blur(4px);transition:opacity .2s ease;
  }
  :root[data-theme="light"] .theme-knob::before{background:radial-gradient(ellipse at 50% 5%,rgba(255,186,63,.75),transparent 50%)}
  @keyframes theme-orbit-spin{to{transform:rotate(1turn)}}
  @media (prefers-reduced-motion:no-preference){
    .theme-toggle:focus-visible .theme-orbit,.theme-toggle:focus-visible .theme-knob::before{opacity:1}
    .theme-toggle:focus-visible .theme-orbit > span,.theme-toggle:focus-visible .theme-knob::before{animation:theme-orbit-spin 2.4s linear infinite}
    @media (hover:hover){
      .theme-toggle:hover .theme-orbit,.theme-toggle:hover .theme-knob::before{opacity:1}
      .theme-toggle:hover .theme-orbit > span,.theme-toggle:hover .theme-knob::before{animation:theme-orbit-spin 2.4s linear infinite}
    }
  }
  .theme-knob svg{grid-area:1/1;width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;transition:opacity .25s ease,transform .35s ease}
  .theme-knob .icon-moon{opacity:1;transform:scale(1)}
  .theme-knob .icon-sun{opacity:0;transform:scale(.65) rotate(-30deg)}
  .theme-label{display:none}
  :root[data-theme="light"] .theme-track{
    background:linear-gradient(145deg,#d5d6d6,#edece8);
    box-shadow:inset 2px 3px 7px rgba(70,70,64,.24),inset -1px -1px 2px rgba(255,255,255,.75),0 1px 0 rgba(255,255,255,.8);
  }
  :root[data-theme="light"] .theme-knob{
    transform:translateX(32px);color:#9a671e;border-color:rgba(255,255,255,.85);
    background:linear-gradient(145deg,#fffefa 0%,#e7e4dc 100%);
    box-shadow:inset 0 1px 2px rgba(255,255,255,.95),0 3px 7px rgba(79,69,53,.25),0 -2px 13px rgba(255,188,66,.55),0 0 5px rgba(255,202,102,.75);
  }
  :root[data-theme="light"] .theme-knob .icon-moon{opacity:0;transform:scale(.65) rotate(30deg)}
  :root[data-theme="light"] .theme-knob .icon-sun{opacity:1;transform:scale(1) rotate(0)}

  /* content */
  main{padding:0 48px 96px;min-width:0}
  .hero{padding:52px 0 0}
  .eyebrow{font-size:11px;font-weight:500;letter-spacing:.02em;text-transform:uppercase;color:var(--blue);margin:0 0 12px}
  h2{font-family:var(--serif);font-weight:700;font-size:40px;line-height:1.15;letter-spacing:-.01em;margin:0 0 16px}
  .dek{font-size:17px;line-height:1.5;color:var(--text-2);margin:0;max-width:none}
  .hero .facts{display:flex;gap:24px;margin-top:24px;flex-wrap:wrap}
  .fact b{display:block;font-family:var(--mono);font-size:13px;color:var(--text)}
  .fact span{font-size:11px;color:var(--dim);letter-spacing:.02em}

  section{padding:0;margin-top:88px;scroll-margin-top:84px}
  section:first-of-type{margin-top:56px}
  .sec-head{display:flex;align-items:baseline;gap:12px;margin:0 0 8px}
  .sec-no{font-family:var(--mono);font-size:11px;color:var(--dim)}
  h3{font-family:var(--serif);font-weight:400;font-size:32px;line-height:1.25;margin:0}
  .sec-sub{color:var(--muted);font-size:13px;margin:8px 0 0;max-width:none}
  h4{display:flex;align-items:center;gap:10px;font-size:16px;font-weight:600;letter-spacing:.01em;margin:40px 0 14px;color:var(--text)}
  h4::before{content:"";width:3px;height:15px;border-radius:2px;background:var(--blue);flex:0 0 auto}
  p{margin:0 0 12px;color:var(--text-2);max-width:none}
  p strong{color:var(--text);font-weight:600}
  .num{font-family:var(--mono);color:var(--text);font-size:13px}

  ul.clean{margin:0 0 16px;padding:0;list-style:none}
  ul.clean li{position:relative;padding-left:16px;color:var(--text-2);margin-bottom:8px;max-width:none}
  ul.clean li::before{content:"";position:absolute;left:0;top:9px;width:4px;height:4px;border-radius:50%;background:var(--dim)}

  .card{background:var(--mid);border:1px solid var(--border-soft);border-radius:var(--radius-card);padding:16px;margin:16px 0}
  .card p:last-child{margin-bottom:0}
  .callout{
    background:rgba(10,132,255,.12);border:1px solid rgba(10,132,255,.25);
    border-radius:var(--radius-card);padding:12px 14px;margin:16px 0;
  }
  .callout p{margin:0;color:var(--text-2);font-size:13px}
  .callout.warn{background:rgba(255,159,10,.10);border-color:rgba(255,159,10,.28)}

  .tw{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:16px 0}
  .tw table{margin:0;min-width:640px}
  table{width:100%;border-collapse:collapse;font-size:12.5px}
  caption{caption-side:top;text-align:left;font-size:11px;color:var(--dim);letter-spacing:0;padding-bottom:8px;line-height:1.6}
  th{
    text-align:left;font-size:11px;font-weight:500;letter-spacing:.02em;text-transform:uppercase;
    color:var(--dim);padding:0 10px 8px;border-bottom:1px solid var(--border);
  }
  td{padding:12px 10px;border-bottom:1px solid var(--border-soft);color:var(--text-2);vertical-align:top;line-height:1.45}
  td:first-child{color:var(--text)}
  tbody tr{transition:background-color .2s ease-out}
  tbody tr:hover{background:var(--hover)}
  td.mono,th.mono{font-family:var(--mono);font-size:12px}

  .rate{font-family:var(--sans);font-size:15px;line-height:1}
  .r-yes{color:var(--green)}
  .r-half{color:var(--orange)}
  .r-no{color:var(--quiet-symbol)}

  .legend{display:flex;gap:16px;flex-wrap:wrap;font-size:12px;color:var(--muted);margin:8px 0 0}
  .note{font-size:12px;color:var(--muted);margin:8px 0 0;max-width:none}
  .legend span{display:inline-flex;align-items:center;gap:6px}

  .tag{display:inline-block;font-size:10px;letter-spacing:.02em;text-transform:uppercase;color:var(--text-2);background:var(--hover);border-radius:var(--radius-pill);padding:2px 8px;margin-right:6px}
  .tag.blue{color:var(--tag-blue);background:rgba(10,132,255,.16)}
  .tag.green{color:var(--tag-green);background:rgba(48,209,88,.14)}

  footer{margin-top:48px;padding-top:24px;border-top:1px solid var(--border-soft);color:var(--dim);font-size:12px}
  footer p{color:var(--dim);font-size:12px;max-width:none}

  @media (max-width:860px){
    .toolbar{height:58px}
    .toolbar-inner{padding:0 20px;gap:14px}
    .toolbar h1{padding-left:14px}
    .shell{grid-template-columns:minmax(0,1fr)}
    .sidebar{position:static;height:auto;width:100%;min-width:0;max-width:100%;padding:18px 20px 12px;border-right:0;border-bottom:1px solid var(--border-soft)}
    .brand{margin:0 0 10px;font-size:13px}
    .brand small{display:inline;margin:0 0 0 8px}
    .nav-hint{display:block;align-self:flex-end;margin:-27px 0 10px;color:var(--muted);font-size:11px;line-height:18px}
    .nav{flex-direction:row;gap:4px;width:100%;max-width:100%;overflow-x:auto;overflow-y:hidden;padding-bottom:6px;-webkit-overflow-scrolling:touch}
    .nav a{flex:0 0 auto;min-height:40px;gap:7px;padding:8px 10px}
    .nav a.active::before{left:10px;right:10px;top:auto;bottom:0;width:auto;height:2px}
    .nav a span.i{width:auto}
    .sidebar .foot{display:none}
    .theme-toggle{position:fixed;left:16px;bottom:max(16px,env(safe-area-inset-bottom));z-index:30;margin:0;padding:6px 10px 6px 6px;border:1px solid var(--border);border-radius:14px;background:var(--switch-bg);box-shadow:0 4px 20px rgba(0,0,0,.15)}
    main{padding:0 20px 88px}
    .hero{padding:36px 0 0}
    section:first-of-type{margin-top:44px}
    section{margin-top:64px;scroll-margin-top:74px}
    h2{font-size:32px}
    h3{font-size:26px}
  }
  @media (max-width:520px){
    .toolbar h1{display:none}
    .toolbar .meta{margin-left:auto}
    .brand small{display:block;margin:3px 0 0}
    .nav-hint{margin-top:-29px}
  }
  @media (prefers-reduced-motion:reduce){
    html{scroll-behavior:auto}
    *{transition:none!important}
  }
  p a{color:inherit;text-decoration:none;border-bottom:1px solid var(--link-border)}
  p a:hover{color:var(--link);border-bottom-color:var(--link)}
  .card p,.callout p{max-width:none}
  td a{color:var(--link);text-decoration:none;border-bottom:1px solid var(--link-border)}
  td a:hover{border-bottom-color:var(--link)}
  .points p{margin:0 0 6px;padding-left:1.6em;text-indent:-1.6em}
  .shot{margin:20px 0 28px}
  .shot img{display:block;width:100%;height:auto;border-radius:10px;border:1px solid var(--border-soft);background:#fff}
  .shot figcaption{margin-top:8px;font-size:11px;color:var(--dim)}

  /* 研究报告的三线表：窄屏保留字段标签并按行展开。 */
  .research-table{margin:20px 0 28px;overflow:visible}
  .research-table table{width:100%;min-width:0;border-collapse:collapse;border-top:2px solid var(--text-2);border-bottom:2px solid var(--text-2);font-size:13px}
  .research-table caption{padding:0 0 10px;color:var(--text-2);font-size:12px;font-weight:600}
  .research-table th{padding:11px 12px;border:0;border-bottom:1px solid var(--text-2);color:var(--text);font-size:12px;font-weight:600;line-height:1.5;text-transform:none;white-space:normal}
  .research-table td{padding:13px 12px;border:0;color:var(--text-2);line-height:1.65;vertical-align:top;overflow-wrap:anywhere}
  .research-table td:first-child{color:var(--text)}
  .research-table tbody tr:hover{background:transparent}
  @media(max-width:700px){
    .research-table table{display:block;border:0}
    .research-table caption{display:block}
    .research-table thead{display:block;border-top:2px solid var(--text-2);border-bottom:1px solid var(--text-2)}
    .research-table thead tr{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
    .research-table thead::after{content:attr(data-mobile-label);display:block;padding:10px 0;color:var(--text);font-size:12px;font-weight:600}
    .research-table tbody{display:block;border-bottom:2px solid var(--text-2)}
    .research-table tbody tr{display:block;padding:10px 0}
    .research-table tbody td{display:block;min-width:0;padding:2px 0;border:0}
    .research-table tbody td:first-child{color:var(--text);font-weight:600}
    .research-table tbody td[data-label]::before{content:attr(data-label)'：';color:var(--muted);font-size:12px;font-weight:400}
  }

  /* 手机目录抽屉；脚本不可用时保留横向目录。 */
  .drawer-open,.drawer-close,.drawer-backdrop{display:none}
  @media(max-width:860px){
    .js-drawer.drawer-visible{overflow:hidden}
    .js-drawer .drawer-open,.js-drawer .drawer-close{display:grid;place-items:center;flex:none;width:38px;height:38px;padding:8px;border:1px solid var(--border);border-radius:8px;background:transparent;color:var(--text);cursor:pointer}
    .drawer-open svg,.drawer-close svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
    .js-drawer .drawer-open:hover,.js-drawer .drawer-close:hover{background:var(--hover)}
    .js-drawer .sidebar{position:fixed;z-index:50;top:0;left:0;width:min(300px,85vw);max-width:85vw;height:100dvh;padding:32px 20px max(24px,env(safe-area-inset-bottom)) 24px;border-right:1px solid var(--border);border-bottom:0;background:var(--bg);box-shadow:12px 0 40px rgba(0,0,0,.2);transform:translateX(-102%);visibility:hidden;transition:none}
    .js-drawer.drawer-animated .sidebar{transition:transform .24s ease,visibility 0s linear .24s}
    .js-drawer.drawer-visible .sidebar{transform:translateX(0);visibility:visible;transition:transform .24s ease,visibility 0s}
    .js-drawer .drawer-close{position:absolute;right:18px;top:22px}
    .js-drawer .brand{margin:0 48px 20px 0;font-size:14px}
    .js-drawer .brand small{display:block;margin:6px 0 0}
    .js-drawer .nav-hint{display:none}
    .js-drawer .nav{flex-direction:column;gap:3px;overflow-x:hidden;overflow-y:auto;padding:0}
    .js-drawer .nav a{flex:none;min-height:42px;gap:12px;padding:10px}
    .js-drawer .nav a span.i{width:18px}
    .js-drawer .nav a.active::before{left:0;right:auto;top:10px;bottom:10px;width:2px;height:auto}
    .js-drawer .sidebar .foot{display:block;margin:auto 0 0;padding-top:22px}
    .js-drawer .theme-toggle{position:static;z-index:auto;margin-top:18px;padding:0;border:0;border-radius:0;background:transparent;box-shadow:none}
    .js-drawer .drawer-backdrop{display:block;position:fixed;z-index:40;inset:0;background:rgba(0,0,0,.52);opacity:0;visibility:hidden;transition:opacity .24s ease,visibility .24s}
    .js-drawer.drawer-visible .drawer-backdrop{opacity:1;visibility:visible}
    .js-drawer .toolbar-inner{gap:10px}
  }
  @media(prefers-reduced-motion:reduce){.js-drawer .sidebar,.js-drawer .drawer-backdrop{transition:none}}