:root{--primary:#0f766e;--primary-deep:#065f46;--accent:#14b8a6;--ink:#1f2937;--muted:#6b7280;--line:#e5e7eb;--bg:#f6f8f7}
*{box-sizing:border-box}
body{padding-top:72px !important}
.site-nav{position:fixed;top:0;left:0;right:0;height:64px;background:linear-gradient(90deg,#022c22,#065f46);color:#fff;z-index:2000;display:flex;align-items:center;justify-content:space-between;padding:0 24px;box-shadow:0 2px 14px rgba(2,44,34,.2);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}
.site-nav a{color:#fff;text-decoration:none}
.site-nav .brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:700;letter-spacing:.2px}
.site-nav .brand .logo{width:32px;height:32px;border-radius:9px;background:rgba(20,184,166,.28);border:1px solid rgba(255,255,255,.2);display:flex;align-items:center;justify-content:center;font-size:17px}
.site-nav .nav-actions{display:flex;align-items:center;gap:10px}
.site-nav .home-link,.nav-dropdown>summary{padding:8px 13px;border-radius:8px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.14);cursor:pointer;font-size:13px;font-weight:600;transition:.18s}
.site-nav .home-link:hover,.nav-dropdown>summary:hover{background:rgba(255,255,255,.2)}
.nav-dropdown{position:relative}
.nav-dropdown>summary{list-style:none;display:flex;align-items:center;gap:7px}
.nav-dropdown>summary::-webkit-details-marker{display:none}
.nav-dropdown[open]>summary{background:rgba(20,184,166,.34)}
.nav-dropdown .menu{position:absolute;top:46px;right:0;width:min(600px,calc(100vw - 28px));background:#fff;color:#1f2937;border:1px solid var(--line);border-radius:14px;box-shadow:0 20px 55px rgba(15,23,42,.2);padding:12px 14px;z-index:2200;max-height:72vh;overflow:auto}
.menu-title{font-size:12px;color:#6b7280;font-weight:800;margin:9px 6px 3px;letter-spacing:.4px}
.menu-grid{display:grid;grid-template-columns:1fr 1fr;gap:3px 6px}
.menu-grid a{padding:7px 9px;border-radius:7px;color:#374151;text-decoration:none;font-size:13px;line-height:1.25;transition:.16s}
.menu-grid a:hover{background:#ecfdf5;color:#0f766e}
.menu-grid a.active{background:#ccfbf1;color:#065f46;font-weight:700}
@media(max-width:720px){.site-nav{padding:0 12px}.site-nav .brand{font-size:15px}.site-nav .home-link{display:none}.menu-grid{grid-template-columns:1fr}.menu{right:-58px}}