:root{
  --bg:#eef3f6;
  --paper:#f7fbfc;
  --ink:#1c2a33;
  --muted:#5b6e7a;
  --line:#cfdbe3;
  --soft:#ffffff;
  --brand:#0f766e;
  --brand2:#148f86;
  --accent:#0e7490;
  --spine:#94a3b8;
  --max:1000px;
  --radius:14px;
  --shadow:0 8px 24px rgba(28,42,51,.07);
  font-family:"IBM Plex Sans","PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
body{
  margin:0;color:var(--ink);line-height:1.75;
  background:
    linear-gradient(180deg,#e8f2f4 0%,var(--bg) 220px),
    var(--bg);
}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto;display:block}
.site-header{
  position:sticky;top:0;z-index:40;
  background:rgba(247,251,252,.94);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  max-width:var(--max);margin:0 auto;padding:.65rem 1rem;
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
}
.brand{display:flex;align-items:center;gap:.6rem;color:var(--ink);font-weight:800}
.brand img{width:40px;height:40px;border-radius:10px;object-fit:cover}
.nav-desktop{display:flex;gap:1rem;flex-wrap:wrap}
.nav-desktop a{color:var(--ink);font-weight:600;font-size:.93rem}
.menu-toggle{
  display:none;border:1px solid var(--line);background:var(--soft);
  border-radius:10px;padding:.4rem .65rem;font-weight:700;cursor:pointer;color:var(--ink);
}
#mobile-nav{display:none;flex-direction:column;gap:.3rem;padding:.4rem 1rem 1rem;border-top:1px solid var(--line);background:var(--paper)}
#mobile-nav.open{display:flex}
#mobile-nav a{padding:.5rem .35rem;color:var(--ink);font-weight:600}
.site-main{max-width:var(--max);margin:0 auto;padding:1rem 1rem 3rem}
.tl-intro{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.25rem 1.15rem;margin-bottom:1.4rem;box-shadow:var(--shadow);
}
.tl-intro h1{margin:0 0 .7rem;font-size:clamp(1.45rem,3vw,2rem);line-height:1.3}
.tl-intro .lead{margin:0;color:var(--muted)}
.tl-badge{
  display:inline-block;margin-bottom:.65rem;padding:.2rem .55rem;
  border-radius:999px;background:rgba(15,118,110,.12);color:var(--brand);
  font-size:.78rem;font-weight:700;letter-spacing:.04em;
}
.tl-spine{
  position:relative;
  margin:0 auto;
  padding:0 0 1rem;
}
.tl-spine::before{
  content:"";
  position:absolute;left:50%;top:0;bottom:0;width:3px;
  background:linear-gradient(180deg,var(--brand),var(--spine));
  transform:translateX(-50%);border-radius:3px;
}
.tl-item{
  position:relative;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:1.4rem;
  margin:0 0 1.6rem;
  align-items:center;
}
.tl-item::after{
  content:"";
  position:absolute;left:50%;top:1.2rem;width:14px;height:14px;
  border-radius:50%;background:var(--brand);border:3px solid #fff;
  box-shadow:0 0 0 2px rgba(15,118,110,.35);
  transform:translateX(-50%);
}
.tl-item:nth-child(even) .tl-media{order:2}
.tl-item:nth-child(even) .tl-body{order:1;text-align:right}
.tl-item:nth-child(even) .tl-body ul{display:inline-block;text-align:left}
.tl-media,.tl-body{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);overflow:hidden;
}
.tl-body{padding:1rem 1.05rem}
.tl-body h2{margin:0 0 .45rem;font-size:1.15rem}
.tl-body p{margin:0 0 .7rem;color:var(--ink)}
.tl-body figcaption,.cap{color:var(--muted);font-size:.9rem}
.tl-media img{width:100%;height:100%;object-fit:cover;min-height:180px}
.tl-closing{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.2rem 1.1rem;margin-top:1rem;box-shadow:var(--shadow);
}
.tl-closing h2{margin:0 0 .7rem}
.faq details{border:1px solid var(--line);border-radius:12px;padding:.7rem .9rem;margin:.5rem 0;background:var(--soft)}
.faq summary{cursor:pointer;font-weight:700}
.peer-inline a{font-weight:700}
.site-footer{border-top:1px solid var(--line);background:rgba(247,251,252,.9);padding:1.4rem 1rem 2rem;color:var(--muted)}
.footer-inner{max-width:var(--max);margin:0 auto}
.footer-nav{display:flex;flex-wrap:wrap;gap:.8rem;margin:.55rem 0 .9rem}
.footer-nav a{color:var(--ink);font-weight:600}
.page-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem 1.1rem;box-shadow:var(--shadow)}
@media (max-width:860px){
  .nav-desktop{display:none}
  .menu-toggle{display:inline-flex}
  .tl-spine::before{left:12px;transform:none}
  .tl-item{grid-template-columns:1fr;padding-left:2rem}
  .tl-item::after{left:12px;transform:none}
  .tl-item:nth-child(even) .tl-media,.tl-item:nth-child(even) .tl-body{order:unset;text-align:left}
}


/* SEO keyword highlight */
strong.kw,.kw{
  color:var(--accent,var(--brand,#e86a2c));
  font-weight:800;
}
mark.kw{
  background:color-mix(in srgb, var(--brand,#e86a2c) 16%, transparent);
  color:inherit;
  padding:0 .12em;
  border-radius:3px;
}
h1 .kw,h2 .kw,h3 .kw{color:var(--brand,#e86a2c)}

/* UNIQUE_HAMBURGER_THEME_START */

/* === unique chrome: hamburger-only + theme === */
:root{--bg:#e9f3f1;--paper:#ffffff;--ink:#0f2f2c;--muted:#4d6f6a;--line:#c5ddd8;--soft:#f4fbfa;--brand:#0d9488;--brand2:#14b8a6;--accent:#0f766e;--header-bg:#0f3d38;--header-fg:#ecfeff;--radius:10px;--shadow:0 8px 22px rgba(15,61,56,.14);--font:"Gill Sans","PingFang SC","Microsoft YaHei",sans-serif;}
body{font-family:var(--font)}
.site-header{
  position:sticky;top:0;z-index:50;
  background:var(--header-bg, var(--paper));
  color:var(--header-fg);
  border-bottom:1px solid var(--line);
}
.site-header .brand{color:var(--header-fg)}
.site-header .brand span{color:var(--header-fg)}
.nav-desktop{display:none!important}
.menu-toggle{
  display:inline-flex!important;align-items:center;justify-content:center;
  width:44px;height:44px;padding:0;cursor:pointer;
  border:1px solid var(--line);background:transparent;color:inherit;
  border-radius:var(--radius);
}
.menu-toggle .burger{
  width:20px;height:14px;display:flex;flex-direction:column;justify-content:space-between;
}
.menu-toggle .burger i{
  display:block;height:2px;width:100%;background:currentColor;border-radius:2px;
  transition:transform .22s ease,opacity .22s ease;
}
.menu-toggle[aria-expanded="true"] .burger i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.menu-toggle[aria-expanded="true"] .burger i:nth-child(2){opacity:0}
.menu-toggle[aria-expanded="true"] .burger i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
#mobile-nav{
  display:none;flex-direction:column;gap:.25rem;
  padding:.65rem 1rem 1rem;border-top:1px solid var(--line);
  background:var(--paper);color:var(--ink);
}
#mobile-nav.open{display:flex}
#mobile-nav a{
  padding:.7rem .55rem;border-radius:calc(var(--radius) / 2);
  color:var(--ink);font-weight:700;
}
#mobile-nav a:hover{background:color-mix(in srgb, var(--brand) 12%, transparent)}
.theme-solid-dark .site-header{/* marker */}

.menu-toggle{border-color:rgba(255,255,255,.25);color:#ecfeff}.menu-toggle .burger i{background:#ecfeff}#mobile-nav{background:#0f3d38}#mobile-nav a{color:#ecfeff}
/* UNIQUE_HAMBURGER_THEME_END */