.site-header { position: sticky; top: 0; z-index: 100; height: 72px; background: rgba(255,255,255,.98); border-bottom: 1px solid #edf0f4; }
.header-inner { width: min(calc(100% - 40px),1360px); height: 100%; margin: 0 auto; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 34px; }
.brand { display: inline-flex; align-items: center; gap: 10px; white-space: nowrap; font-size: 21px; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; color: #fff; background: var(--blue,#2878f0); font-size: 16px; font-weight: 700; }
.desktop-nav { display: flex; justify-content: center; align-items: center; gap: clamp(18px,2.1vw,36px); }
.desktop-nav > a, .scene-menu > summary { position: relative; color: inherit; font-size: 14px; font-weight: 600; line-height: 1.5; white-space: nowrap; cursor: pointer; list-style: none; }
.desktop-nav > a:hover, .desktop-nav > a.active, .scene-menu > summary:hover, .scene-menu > summary.active, .scene-menu[open] > summary { color: var(--blue,#2878f0); }
.desktop-nav > a.active::after, .scene-menu > summary.active::after { content: ""; position: absolute; left: 0; right: 0; bottom: -25px; height: 2px; background: var(--blue,#2878f0); }
.scene-menu { position: relative; }
.scene-menu > summary::-webkit-details-marker, .mobile-menu > summary::-webkit-details-marker, .mobile-scenes > summary::-webkit-details-marker { display: none; }
.scene-menu-panel { position: absolute; top: 38px; left: 50%; width: 380px; max-height: min(520px,70vh); padding: 10px; overflow-y: auto; transform: translateX(-50%); background: #fff; border: 1px solid var(--line,#dfe5ee); box-shadow: 0 18px 45px rgba(30,49,78,.14); }
.scene-menu-panel a { display: block; padding: 11px 12px; border-left: 3px solid transparent; }
.scene-menu-panel a:hover, .scene-menu-panel a.active { background: #f2f7ff; border-left-color: var(--blue,#2878f0); }
.scene-menu-panel strong { display: block; color: var(--ink,#152238); font-size: 14px; }
.scene-menu-panel span { display: block; margin-top: 2px; color: var(--muted,#5e6c80); font-size: 12px; line-height: 1.5; }
.scene-menu-empty { margin: 0; padding: 14px 12px; color: var(--muted,#5e6c80); font-size: 13px; }
.login-button { display: inline-flex; min-height: 42px; padding: 9px 20px; align-items: center; justify-content: center; color: #fff; background: var(--blue,#2878f0); border: 1px solid var(--blue,#2878f0); border-radius: 6px; font-weight: 700; }
.login-button:hover { background: var(--blue-dark,#1559bd); border-color: var(--blue-dark,#1559bd); }
.mobile-menu { display: none; }
.site-footer { padding: 48px 0 26px; color: #ced7e6; background: var(--footer,#182438); }
.footer-inner { display: grid; grid-template-columns: 1fr auto; gap: 32px; }
.footer-inner strong { color: #fff; font-size: 20px; }
.footer-inner p { margin: 8px 0 0; }
.footer-inner nav { display: flex; flex-wrap: wrap; gap: 28px; align-items: start; }
.footer-inner nav a:hover { color: #fff; }
.copyright { grid-column: 1/-1; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.12); font-size: 13px; }
@media (max-width:1050px) {
    .desktop-nav { gap: 18px; }
    .desktop-nav > a:nth-last-of-type(-n+2) { display: none; }
}
@media (max-width:820px) {
    .site-header { height: 64px; }
    .header-inner { width: calc(100% - 30px); grid-template-columns: 1fr auto; gap: 12px; }
    .desktop-nav, .login-button { display: none; }
    .mobile-menu { display: block; position: relative; }
    .mobile-menu > summary { width: 40px; height: 40px; display: grid; place-content: center; list-style: none; cursor: pointer; }
    .mobile-menu > summary .menu-icon { display: block; width: auto; height: auto; color: var(--ink,#152238); background: transparent; box-shadow: none; font-size: 25px; line-height: 1; font-weight: 700; }
    .mobile-menu > nav { position: absolute; right: 0; top: 48px; width: min(300px,calc(100vw - 30px)); max-height: calc(100vh - 82px); padding: 10px; overflow-y: auto; background: #fff; border: 1px solid var(--line,#dfe5ee); box-shadow: 0 14px 36px rgba(30,49,78,.16); }
    .mobile-menu > nav > a, .mobile-scenes > summary, .mobile-scenes > a, .mobile-scenes > span { display: block; padding: 10px 12px; }
    .mobile-scenes > summary { font-weight: 700; cursor: pointer; list-style: none; }
    .mobile-scenes > summary::after { content: "+"; float: right; color: var(--blue,#2878f0); }
    .mobile-scenes[open] > summary::after { content: "−"; }
    .mobile-scenes > a, .mobile-scenes > span { margin-left: 10px; color: var(--muted,#5e6c80); font-size: 13px; }
    .mobile-scenes > a:hover { color: var(--blue,#2878f0); }
    .footer-inner { grid-template-columns: 1fr; }
    .copyright { grid-column: auto; }
}
@media (max-width:480px) { .brand { font-size: 18px; } }