/* 导航与中文引导带：作为三套模板共用的界面层。 */
.topbar{position:fixed;border:0;background:linear-gradient(180deg,rgba(6,34,48,.67),rgba(6,34,48,.08));transition:background .25s,box-shadow .25s;isolation:isolate}
.topbar.scrolled,.nav-open .topbar{background:rgba(10,45,54,.94);box-shadow:0 10px 32px #071d2940;backdrop-filter:blur(18px)}
.topbar-inner{height:86px;gap:24px}
.topbar .brand{min-width:230px;gap:11px}
.topbar .brand img{width:44px;height:44px;border-radius:13px;border:1px solid #ffffff80;box-shadow:0 4px 14px #0005}
.topbar .brand strong{font-size:19px;line-height:1.25;letter-spacing:.06em}
.topbar .brand small{margin-top:3px;font-size:10px;letter-spacing:.12em;color:#e5dbbe;opacity:1}
.topbar .desktop-nav{display:flex;align-items:center;gap:3px;margin:auto;padding:5px;background:rgba(8,35,49,.65);border:1px solid rgba(255,255,255,.22);border-radius:999px;box-shadow:inset 0 1px #ffffff1f,0 8px 25px #061b2233;backdrop-filter:blur(14px)}
.topbar .desktop-nav a{position:relative;padding:11px 20px;border-radius:999px;white-space:nowrap;font-size:13px;font-weight:700;letter-spacing:.04em;opacity:.86;transition:background .2s,color .2s,opacity .2s}
.topbar .desktop-nav a:hover,.topbar .desktop-nav a.is-active{background:#f1b65b;color:#173c3f;opacity:1}
.topbar .top-download{display:flex;align-items:center;gap:15px;margin:0;padding:6px 7px 6px 20px;min-height:47px;border:1px solid #ffdb9a;border-radius:999px;background:linear-gradient(135deg,#f7c570,#e8a341);color:#123b42;box-shadow:0 5px 16px #071c2640;font-size:13px;letter-spacing:.05em;transition:transform .2s,box-shadow .2s}
.topbar .top-download:hover{transform:translateY(-2px);box-shadow:0 9px 20px #071c2660}
.topbar .top-download .download-arrow{display:grid;place-items:center;width:33px;height:33px;padding:0;border-radius:50%;background:#163f45;color:#fff;font-size:17px}
.topbar .mobile-nav,.menu-button,.menu-backdrop{display:none}
.topbar a:focus-visible,.menu-button:focus-visible{outline:2px solid #ffe3a6;outline-offset:3px}
.ribbon{background:linear-gradient(90deg,#123d43,#1b5555 52%,#123d43);color:#f5ebd5;border:0;box-shadow:inset 0 1px #ffffff20,inset 0 -1px #ffffff18}
.ribbon .ribbon-inner{display:flex;align-items:center;justify-content:center;gap:clamp(18px,3.5vw,54px);min-height:64px;padding:12px 0;font-size:15px;font-weight:800;letter-spacing:.18em;white-space:nowrap;word-spacing:normal}
.ribbon .ribbon-inner b{margin:0;color:#e7b76e;font-size:12px;line-height:1}
.kicker,.section-index{letter-spacing:.12em}
.footer-inner small{letter-spacing:.12em}
.section[id],.download[id]{scroll-margin-top:86px}
@media(max-width:1100px) and (min-width:901px){.topbar .brand{min-width:190px}.topbar .desktop-nav a{padding:11px 13px}.topbar-inner{gap:14px}}
@media(max-width:900px){
  .topbar{background:rgba(11,47,58,.78);backdrop-filter:blur(14px)}
  .topbar-inner{height:72px;gap:12px}
  .topbar .brand{min-width:0;margin-right:auto}
  .topbar .desktop-nav{display:none}
  .topbar .top-download{display:none}
  .topbar .menu-button{display:flex;align-items:center;justify-content:center;gap:9px;min-width:88px;height:42px;padding:0 12px;border:1px solid #ffffff70;border-radius:999px;background:#ffffff16;color:#fff;font-size:12px;font-weight:800;letter-spacing:.08em}
  .menu-lines{display:flex;flex-direction:column;justify-content:center;gap:5px;width:17px;height:18px}
  .menu-lines i{display:block;width:17px;height:2px;border-radius:2px;background:#f1c37b;transition:transform .2s}
  .nav-open .menu-lines i:first-child{transform:translateY(3.5px) rotate(45deg)}
  .nav-open .menu-lines i:last-child{transform:translateY(-3.5px) rotate(-45deg)}
  .topbar .mobile-nav{display:flex;flex-direction:column;position:absolute;top:80px;left:18px;right:18px;width:min(500px,calc(100% - 36px));max-height:calc(100vh - 98px);overflow:auto;margin:0 auto;padding:12px;border:1px solid #f0dbb760;border-radius:20px;background:#103c45;box-shadow:0 25px 55px #031921a3;opacity:0;visibility:hidden;transform:translateY(-10px);pointer-events:none;transition:opacity .22s,transform .22s,visibility .22s;gap:0;z-index:2}
  .nav-open .topbar .mobile-nav{opacity:1;visibility:visible;transform:translateY(0);pointer-events:auto}
  .topbar .mobile-nav a{display:flex;align-items:center;justify-content:space-between;padding:16px 17px;border-radius:12px;color:#fff;font-size:16px;font-weight:800;letter-spacing:.05em;opacity:1}
  .topbar .mobile-nav a+a{border-top:1px solid #ffffff20}
  .topbar .mobile-nav a:hover,.topbar .mobile-nav a.is-active{background:#ffffff14;color:#f6c878}
  .topbar .mobile-nav a b{color:#91b2ae;font-size:11px;font-weight:700}
  .topbar .mobile-nav .mobile-download{margin-top:10px;background:linear-gradient(135deg,#f6c674,#e9a342);color:#193c3d;border:0}
  .topbar .mobile-nav .mobile-download b{color:#193c3d;font-size:18px}
  .menu-backdrop{display:block;position:fixed;inset:0;background:#041a23a8;z-index:19;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}
  .nav-open .menu-backdrop{opacity:1;visibility:visible;pointer-events:auto}
  .ribbon .ribbon-inner{gap:clamp(12px,3vw,24px);min-height:54px;font-size:13px;letter-spacing:.12em}
}
@media(max-width:600px){
  .topbar .brand img{width:40px;height:40px}
  .topbar .brand strong{font-size:16px}
  .topbar .brand small{font-size:9px}
  .ribbon .ribbon-inner{gap:11px;font-size:11px;letter-spacing:.05em;padding:10px 0}
  .ribbon .ribbon-inner b{font-size:9px}
}