:root{--nb-bg: #0f172a;--nb-accent: #f59e0b;--nb-text: #e2e8f0;--nb-dropdown-bg: #1e293b;--nb-height: 58px}.nb__bar{position:sticky;top:0;z-index:1000;background:var(--nb-bg);height:var(--nb-height);display:flex;align-items:center;padding:0 1.5rem;box-shadow:0 2px 16px #00000059;border-bottom:2px solid var(--nb-accent);box-sizing:border-box}.nb__bar *,.nb__bar *:before,.nb__bar *:after{box-sizing:border-box;margin:0;padding:0}.nb__brand{font-family:Noto Sans TC,sans-serif;font-weight:700;font-size:1.05rem;color:var(--nb-accent);text-decoration:none;letter-spacing:.02em;white-space:nowrap;margin-right:auto}.nb__menu{display:flex;align-items:center;list-style:none}.nb__group{position:relative}.nb__group-btn{display:flex;align-items:center;gap:5px;padding:0 1.1rem;height:var(--nb-height);background:none;border:none;border-bottom:3px solid transparent;color:var(--nb-text);font-family:Noto Sans TC,sans-serif;font-size:.95rem;font-weight:500;cursor:pointer;transition:color .18s,background .18s,border-color .18s;white-space:nowrap;line-height:1}.nb__chevron{display:inline-block;font-size:.65rem;transition:transform .22s;margin-top:1px}.nb__group:hover .nb__group-btn,.nb__group:focus-within .nb__group-btn{color:var(--nb-accent);background:#f59e0b12;border-bottom-color:var(--nb-accent)}.nb__group:hover .nb__chevron,.nb__group:focus-within .nb__chevron{transform:rotate(180deg)}.nb__dropdown{position:absolute;top:calc(100% + 2px);left:0;min-width:150px;background:var(--nb-dropdown-bg);border:1px solid rgba(245,158,11,.25);border-radius:8px;box-shadow:0 8px 32px #00000073;overflow:hidden;opacity:0;pointer-events:none;transform:translateY(-6px);transition:opacity .2s,transform .2s;z-index:200}.nb__group:hover .nb__dropdown,.nb__group:focus-within .nb__dropdown{opacity:1;pointer-events:auto;transform:translateY(0)}.nb__dropdown a{display:block;padding:.7rem 1.2rem;color:var(--nb-text);text-decoration:none;font-family:Noto Sans TC,sans-serif;font-size:.9rem;font-weight:400;transition:background .15s,color .15s;border-left:3px solid transparent}.nb__dropdown a:hover{background:#f59e0b21;color:var(--nb-accent);border-left-color:var(--nb-accent)}.nb__dropdown a.nb__active{color:var(--nb-accent);background:#f59e0b1a;border-left-color:var(--nb-accent);font-weight:600}.nb__toggle{display:none;background:none;border:none;cursor:pointer;flex-direction:column;gap:5px;padding:6px}.nb__toggle span{display:block;width:24px;height:2px;background:var(--nb-text);border-radius:2px;transition:all .25s}@media(max-width:640px){.nb__toggle{display:flex}.nb__menu{position:fixed;top:var(--nb-height);left:0;right:0;background:var(--nb-bg);flex-direction:column;align-items:stretch;border-top:1px solid rgba(245,158,11,.2);box-shadow:0 8px 32px #0006;max-height:0;overflow:hidden;transition:max-height .3s ease}.nb__menu.nb__open{max-height:500px}.nb__group{width:100%}.nb__group-btn{width:100%;height:auto;padding:.85rem 1.4rem;border-bottom:none;border-left:3px solid transparent;justify-content:space-between}.nb__group:hover .nb__group-btn,.nb__group.nb__open .nb__group-btn{border-left-color:var(--nb-accent);border-bottom:none}.nb__dropdown{position:static;opacity:1;pointer-events:none;transform:none;box-shadow:none;border:none;border-radius:0;background:#0003;max-height:0;overflow:hidden;transition:max-height .25s ease}.nb__group.nb__open .nb__dropdown{pointer-events:auto;max-height:300px}.nb__dropdown a{padding-left:2.2rem}}.nb__group--link{display:flex;align-items:center}.nb__group-btn--link{text-decoration:none;color:var(--nb-text);display:flex;align-items:center;height:var(--nb-height);padding:0 1.1rem;border-bottom:3px solid transparent;font-size:.95rem;font-weight:500;transition:color .18s,background .18s,border-color .18s;white-space:nowrap}.nb__group-btn--link:hover,.nb__group-btn--link.nb__active-page{color:var(--nb-accent);background:#f59e0b12;border-bottom-color:var(--nb-accent)}@media(max-width:640px){.nb__group-btn--link{height:auto;padding:.85rem 1.4rem;border-bottom:none;border-left:3px solid transparent;width:100%}.nb__group-btn--link:hover,.nb__group-btn--link.nb__active-page{border-left-color:var(--nb-accent);border-bottom:none;background:#f59e0b12}}