/* Top navigation bar — shared by all room & input pages.
   Loaded AFTER base.css / theme-room.css; page-local CSS loads last and wins. */

.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 200;
    height: 48px;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 clamp(1.5rem, 5vw, 4rem);
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    backdrop-filter: blur(20px) saturate(1.1);
    -webkit-backdrop-filter: blur(20px) saturate(1.1);
    border-bottom: 1px solid rgba(255,255,255,0.12);
}
[data-theme="light"] .nav { background: rgba(255,255,255,0.85); }
[data-theme="light"] .nav { border-bottom-color: rgba(0,0,0,0.12); }

.theme-btn { width: 28px; height: 28px; border: 1px solid #706c65; border-radius: 50%; background: none; color: #dbdad7; font-size: 0.68rem; cursor: pointer; transition: all 0.3s; display: flex; align-items: center; justify-content: center; }
.theme-btn:hover { border-color: var(--accent); color: var(--accent); }

.nav:not(.fansroom-global-nav) > .nav-brand {
    display: inline-grid;
    grid-template-columns: 38px auto;
    align-items: center;
    gap: 0.78rem;
    font-family: var(--font-body, 'Noto Sans SC', 'PingFang SC', sans-serif);
    font-size: var(--fs-body, 0.9rem);
    font-weight: 540;
    letter-spacing: 0.03rem;
    text-transform: none;
    color: var(--text);
    text-decoration: none;
    line-height: 1;
    white-space: nowrap;
    transition: color 0.22s var(--ease, ease);
}
.nav:not(.fansroom-global-nav) > .nav-brand::before {
    content: '';
    width: 31px;
    height: 31px;
    display: inline-block;
    color: var(--accent);
    background: currentColor;
    -webkit-mask: url('/static/img/brand/fansroom-avatar.svg') center / 142% no-repeat;
    mask: url('/static/img/brand/fansroom-avatar.svg') center / 142% no-repeat;
    transition: color 0.22s var(--ease, ease), transform 0.22s var(--ease, ease);
}
.nav:not(.fansroom-global-nav) > .nav-brand:hover {
    color: var(--accent);
}
.nav:not(.fansroom-global-nav) > .nav-brand:hover::before {
    transform: translateY(-1px);
}
.nav-right { display: flex; align-items: center; gap: 1.8rem; }
.nav-link { font-family: var(--font-body); font-size: 0.7rem; font-weight: 400; letter-spacing: 0.06rem; color: var(--text-3); text-decoration: none; transition: color 0.2s; }
.nav-link:hover { color: var(--text); }

.nav-contact { position: relative; cursor: pointer; display: flex; align-items: center; }
.contact-popup { position: absolute; top: 100%; right: -40px; margin-top: 12px; display: flex; gap: 1.5rem; padding: 1.2rem 1.5rem; background: var(--bg-3); border: 1px solid var(--glass-bh); border-radius: 10px; box-shadow: 0 12px 40px rgba(0,0,0,0.3); opacity: 0; visibility: hidden; transform: translateY(-6px); transition: all 0.25s var(--ease); z-index: 300; }
.nav-contact:hover .contact-popup { opacity: 1; visibility: visible; transform: translateY(0); }
.contact-item { display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }
.contact-item img { border-radius: 6px; opacity: 0.9; }
.contact-item span { font-family: var(--font-mono); font-size: 0.5rem; color: var(--text-2); letter-spacing: 0.04rem; white-space: nowrap; }

.nav-shop { color: var(--accent); border: 1px solid var(--accent); padding: 4px 12px; border-radius: 4px; transition: all 0.3s; }
.nav-shop:hover { background: var(--accent); color: var(--bg); }

@media (max-width: 768px) {
    .nav-right { gap: 1rem; }
    .nav-link { font-size: 0.65rem; letter-spacing: 0.02rem; }
    .nav-shop { padding: 3px 8px; }
}