/* Header markup and visual rules copied from the existing repository. */
:root{--primary:#099dfd;--primary-deep:#0072e5;--heading:#181f27;--text:#586376;--light-bg:#f8f9fc;--line:rgba(24,31,39,.08)}
.island{--ease:cubic-bezier(.22,.68,.32,1);--ease-out:cubic-bezier(.16,1,.3,1)}
.island{position:absolute;top:42px;left:0;width:100%;z-index:300;--hc:#fff;--hc-dim:rgba(255,255,255,.78)}
.island .bar{max-width:1400px;margin:0 auto;padding:0 36px;height:78px;display:flex;align-items:center;gap:36px;transition:height .45s var(--ease)}
.island.float{
  position:fixed;top:12px;left:50%;transform:translateX(-50%);
  width:min(1200px,calc(100% - 24px));
  --hc:#181F27;--hc-dim:#586376;
  background:rgba(255,255,255,.78);
  backdrop-filter:blur(26px) saturate(1.5);-webkit-backdrop-filter:blur(26px) saturate(1.5);
  border-radius:999px;border:1px solid rgba(24,31,39,.06);
  box-shadow:0 18px 48px rgba(2,5,17,.16),0 2px 8px rgba(2,5,17,.06);
  animation:islandIn .55s var(--ease-out) both;
}
@keyframes islandIn{from{transform:translate(-50%,-130%);opacity:.4}to{transform:translate(-50%,0);opacity:1}}
.island.float .bar{height:58px;padding:0 14px 0 26px}
.island .sw-logo{display:flex;align-items:center;gap:12px;text-decoration:none;flex:none}
.island .sw-logo svg path{fill:var(--hc);transition:fill .3s}
.island.float .sw-logo svg path{fill:var(--primary)}
.island .sw-logo .divider{width:1px;height:20px;background:currentColor;opacity:.25;color:var(--hc)}
.island .sw-logo .prod{font-size:16px;font-weight:600;color:var(--hc);white-space:nowrap;transition:color .3s;line-height:1;transform:translateY(2px)}
.island nav{display:flex;gap:2px;align-items:center;flex:1;justify-content:center}
.island nav a{padding:8px 13px;border-radius:999px;font-size:14px;font-weight:500;color:var(--hc-dim);text-decoration:none;white-space:nowrap;transition:color .25s,background .25s}
.island nav a:hover{color:var(--hc);background:rgba(127,160,200,.14)}
.island .actions{display:flex;gap:10px;align-items:center;flex:none}
.lang-switch{display:flex;align-items:center;border:1px solid color-mix(in srgb,var(--hc) 22%,transparent);border-radius:999px;padding:3px;cursor:pointer;gap:2px}
.lang-switch span{font-size:12px;font-weight:600;padding:3px 10px;border-radius:999px;color:var(--hc-dim);transition:.25s;user-select:none}
.lang-switch span.on{background:var(--hc);color:#0B1220}
.island.float .lang-switch span.on{color:#fff}
.btn-login{color:var(--hc);text-decoration:none;padding:8px 18px;border-radius:999px;font-size:14px;font-weight:600;transition:.25s;border:1px solid color-mix(in srgb,var(--hc) 22%,transparent)}
.btn-login:hover{border-color:var(--hc)}
.btn-try{background:var(--primary);color:#fff;text-decoration:none;padding:9px 21px;border-radius:999px;font-size:14px;font-weight:600;transition:.25s;box-shadow:0 6px 18px rgba(9,157,253,.3)}
.btn-try:hover{background:var(--primary-deep);transform:translateY(-1px)}
@media(max-width:1200px){.island nav{display:none}.island .bar{justify-content:space-between}}
@media(max-width:640px){.btn-login{display:none}.island .sw-logo .prod,.island .sw-logo .divider{display:none}}
.island nav{position:relative}
.island nav .nav-item{align-self:stretch;display:inline-flex;align-items:center}
.island nav .nav-item.simple{position:relative}
.island nav .nav-item>a{display:inline-flex;align-items:center;gap:5px}
.island nav .nav-item>a::after{content:"";width:5px;height:5px;border-right:1.6px solid currentColor;border-bottom:1.6px solid currentColor;transform:rotate(45deg) translateY(-1px);opacity:.5;transition:transform .25s var(--ease),opacity .25s}
.island nav .nav-item:hover>a::after{transform:rotate(225deg) translateY(1px);opacity:.85}

/* 浮层容器（含 hover 桥，防断层） */
.island nav .nav-pop{position:absolute;top:100%;padding-top:13px;opacity:0;visibility:hidden;transition:opacity .2s var(--ease);z-index:600}
.island nav .nav-item.simple .nav-pop{left:50%;transform:translateX(-50%)}
.island nav .nav-item.mega .nav-pop{left:50%;transform:translateX(-50%)}
.island nav .nav-item:hover .nav-pop{opacity:1;visibility:visible}

/* 卡片通用 */
.island nav .nav-card{background:#fff;border:1px solid rgba(24,31,39,.07);border-radius:18px;box-shadow:0 24px 64px rgba(2,5,17,.20),0 4px 12px rgba(2,5,17,.08);transform:translateY(-8px);transition:transform .2s var(--ease)}
.island nav .nav-item:hover .nav-card{transform:translateY(0)}

/* 简单列表 */
.island nav .nav-card.simple{min-width:224px;padding:8px}
.island nav .nav-card.simple a{display:block;padding:9px 13px;border-radius:10px;font-size:14px;font-weight:500;color:#181F27;white-space:nowrap;transition:background .15s,color .15s}
.island nav .nav-card.simple a:hover{background:#EBF1F9;color:#0072E5}

/* mega 多列 */
.island nav .nav-card.mega{padding:22px 24px;display:flex;flex-wrap:wrap;align-items:flex-start;gap:10px 24px;width:max-content;max-width:min(1380px,96vw)}
.island nav .nav-grp{width:268px;display:flex;flex-direction:column}
.island nav .nav-grp-h{font-size:12px;font-weight:600;color:#99A1B0;letter-spacing:.04em;padding:6px 10px 6px;margin-top:2px}
.island nav .nav-card.mega a{display:flex;flex-direction:column;gap:3px;min-height:54px;padding:9px 11px;border-radius:11px;text-decoration:none;white-space:normal;transition:background .15s}
.island nav .nav-card.mega a:hover{background:#EBF1F9}
.island nav .nav-card.mega a b{font-size:14px;font-weight:600;color:#181F27;line-height:1.3;transition:color .15s}
.island nav .nav-card.mega a span{font-size:12px;color:#99A1B0;line-height:1.42;white-space:normal;overflow-wrap:anywhere}
.island nav .nav-card.mega a:hover b{color:#0072E5}
.island nav .nav-card.solutions-menu{
  display:grid;grid-template-columns:repeat(5, minmax(168px,1fr));gap:14px 22px;
  width:min(980px,86vw);padding:20px 44px 22px;align-items:start;box-sizing:border-box;
}
.island nav .nav-card.solutions-menu .nav-grp{width:auto}
.island nav .nav-card.solutions-menu .nav-grp-h{padding:4px 8px 8px}
.island nav .nav-card.solutions-menu a{min-height:0;padding:7px 8px;gap:0}
@media(max-width:640px){.island{top:18px}.island .bar{height:58px;padding:0 18px;gap:12px}.island.float{top:10px;width:calc(100% - 20px)}.island.float .bar{height:54px;padding:0 10px 0 18px}.island .sw-logo svg{width:42px;height:auto}.island .actions{gap:8px}.btn-try{padding:8px 14px;font-size:13px}.btn-login{display:none}.island .sw-logo .prod,.island .sw-logo .divider{display:none}}
.island nav .nav-item:focus-within .nav-pop{opacity:1;visibility:visible}.island nav .nav-item:focus-within .nav-card{transform:translateY(0)}