/* Shared professional site header - used on index.html and guide.html */
:root {
    --json-dark: #0f172a;
    --json-dark-2: #1e293b;
    --json-dark-light: #334155;
    --json-accent: #f59e0b;
}

.site-topbar {
    position: relative;
    z-index: 3;
    background: linear-gradient(135deg, var(--json-dark) 0%, var(--json-dark-2) 60%, var(--json-dark-light) 100%);
    padding: 14px 0;
}
.site-topbar-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; max-width: 1200px; margin: 0 auto; padding: 0 20px; box-sizing: border-box; }
.site-topbar .brand-link { color: #fff; text-decoration: none; display: flex; align-items: center; gap: 10px; }
.site-topbar .brand-link i { font-size: 1.3em; }
.site-topbar .brand-link span, .site-topbar .brand-link h1 { font-weight: 700; font-size: 1.15em; margin: 0; color: #fff; }
.site-nav { display: flex; align-items: center; gap: 22px; }
.site-nav a { color: rgba(255,255,255,.9); text-decoration: none; font-size: .95em; font-weight: 500; display: flex; align-items: center; gap: 6px; transition: color .2s ease; }
.site-nav a:hover { color: #fff; }
.site-nav a.is-cta { background: rgba(255,255,255,.15); border: 1px solid rgba(255,255,255,.35); padding: 8px 16px; border-radius: 30px; }
.site-nav a.is-cta:hover { background: #fff; color: var(--json-dark); }

.header-mode-toggle { display: flex; align-items: center; gap: 8px; }
.header-mode-toggle .button { margin: 0; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.3); color: rgba(255,255,255,.9); padding: 7px 14px; border-radius: 30px; font-size: .85em; cursor: pointer; transition: all .2s ease; }
.header-mode-toggle .button:hover { background: rgba(255,255,255,.22); color: #fff; }
.header-mode-toggle .button.active { background: #fff; color: var(--json-dark); border-color: #fff; font-weight: 600; }

@media (max-width: 860px) {
    .site-nav { gap: 12px; }
    .site-nav a span.nav-text { display: none; }
}

@media (max-width: 700px) {
    .header-mode-toggle { order: 3; width: 100%; justify-content: center; margin-top: 6px; }
}