/* No color values here—only layout/structure/behavior. */
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; font: 16px/1.6 system-ui, -apple-system, Segoe UI, Roboto, sans-serif; background: var(--bg); color: var(--ink); }
.container { max-width: 960px; margin: 0 auto; padding: 0 16px; }


/* Header */
.site-header { background: var(--panel); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 50; }
.brand { margin: 0; padding: 16px 0 8px; font-size: 20px; }
.brand a { color: var(--ink); text-decoration: none; }


/* Nav + Tabs */
.site-nav { position: relative; }
.tabs { display: flex; gap: 8px; padding-bottom: 12px; border-bottom: 1px solid var(--border); background: transparent; }
.tab { display: inline-block; padding: 10px 14px; border-radius: 10px; color: var(--muted); text-decoration: none; transition: .15s ease-in-out; }
.tab:hover { color: var(--ink); background: var(--hover); }
.tab.active { background: var(--brand); color: var(--brand-ink); font-weight: 600; box-shadow: 0 0 0 3px var(--ring); }


/* Hamburger */
.hamburger { display: none; font-size: 26px; background: none; border: none; color: var(--ink); cursor: pointer; padding: 8px; }
.hamburger-label { font-size: 16px; margin-left: 6px; vertical-align: middle; }


/* Main */
main.container { padding: 24px 16px 64px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 18px; }
.card h2 { margin-top: 0; }


/* Layout helpers */
.grid-2 { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 768px) { .grid-2 { grid-template-columns: 1fr 1fr; } }


/* Footer */
.site-footer { border-top: 1px solid var(--border); background: var(--panel); color: var(--muted); }
.site-footer .container { padding: 16px; }


/* Links */
a { color: var(--brand); }
a:hover { text-decoration: underline; }


/* Responsive behavior */
@media (max-width: 640px) {
.hamburger { display: block; }
.tabs { display: none; flex-direction: column; background: var(--panel); border: 1px solid var(--border); position: absolute; top: 100%; left: 0; right: 0; z-index: 100; }
.tabs.open { display: flex; }
.tab { border-radius: 0; border-bottom: 1px solid var(--border); }
.tab:last-child { border-bottom: none; }
}


@media (min-width: 641px) {
.hamburger-label { display: none; }
}

.page-note { color: #555; font-size: 0.95rem; margin-bottom: 2rem; }
    .item { margin: 1rem 0; }
    .speaker { font-weight: bold; }